.TH MPI_Wtime 3 "11/6/2008" " " "MPI"
.SH NAME
MPI_Wtime \-  Returns an elapsed time on the calling processor 
.SH SYNOPSIS
.nf
double MPI_Wtime( void )
.fi
.SH RETURN VALUE
Time in seconds since an arbitrary time in the past.

.SH NOTES
This is intended to be a high-resolution, elapsed (or wall) clock.
See 
.I MPI_WTICK
to determine the resolution of 
.I MPI_WTIME
\&.

If the attribute 
.I MPI_WTIME_IS_GLOBAL
is defined and true, then the
value is synchronized across all processes in 
.I MPI_COMM_WORLD
\&.


.SH NOTES FOR FORTRAN
This is a function, declared as 
.I DOUBLE PRECISION MPI_WTIME()
in Fortran.

.SH SEE ALSO
also: MPI_Wtick, MPI_Comm_get_attr, MPI_Attr_get
.br
.SH LOCATION
wtime.c
